JP6864068B2 - Exhaust gas supply system and exhaust gas supply method - Google Patents

Description

The present invention relates to an exhaust gas supply system and an exhaust gas supply method for supplying exhaust gas generated in a combustion furnace to an exhaust gas user.

Conventionally, it has been practiced to promote the growth of plants in a plant growing facility by supplying an exhaust gas containing carbon dioxide (hereinafter, appropriately referred to as "CO _{2") to the plant growing facility.} For example, Patent Document 1 discloses a system for introducing a combustion exhaust gas generated by burning a decomposition gas with a waste heat boiler into a facility gardening facility. Further, Patent Document 2 discloses a system for supplying _{CO 2} in exhaust gas emitted from a prime mover to a greenhouse when generating electricity using a fuel containing carbon.

Japanese Unexamined Patent Publication No. 2006-191876 Patent No. 4846632

Here, in order to promote the growth of plants, it is desirable to control the plant growth equipment to a temperature and relative humidity suitable for growing plants. Therefore, it is desirable that the temperature and moisture content of the exhaust gas supplied to the plant growing facility are appropriately adjusted so that the plant growing facility is controlled to a temperature and relative humidity suitable for growing the plant. However, the system disclosed in Patent Document 1 controls the supply amount of the combustion exhaust gas _{to adjust the CO 2} concentration of the facility gardening equipment, but does not adjust the temperature and the water content of the combustion exhaust gas. Further, in the system disclosed in Patent Document 2, the greenhouse is heated by the exhaust heat of the prime mover, but the moisture content of the exhaust gas is not adjusted. Therefore, since the systems disclosed in Patent Documents 1 and 2 do not adjust both the temperature and the water content of the exhaust gas, there is a possibility that the growth of plants cannot be promoted.

Therefore, the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an exhaust gas supply system and an exhaust gas supply method capable of promoting the growth of plants.

One aspect of the present invention made to solve the above problems is a requirement of the plant growing facility in an exhaust gas supply system for supplying an exhaust gas containing carbon dioxide generated by burning fuel in a combustion furnace to the plant growing facility. It is characterized by having a temperature / moisture adjusting unit for adjusting the temperature of the exhaust gas and the moisture content of the exhaust gas according to the above.

According to this aspect, the exhaust gas containing carbon dioxide can be supplied to the plant growing facility after adjusting the temperature and the water content to meet the requirements of the plant growing facility. Therefore, the temperature and relative humidity of the plant growing facility are controlled to appropriate values for promoting the growing of plants. Therefore, it is possible to promote the growth of plants.

In the above aspect, the temperature / moisture adjusting unit adjusts the temperature of the exhaust gas and the moisture content of the exhaust gas by lowering the temperature of the exhaust gas to a predetermined temperature and then raising the temperature to a target temperature. The predetermined temperature is preferably a temperature at which the saturated water vapor content is equal to the water vapor content per predetermined volume of the target exhaust gas.

According to this aspect, the temperature and the water content of the exhaust gas can be adjusted to the values required by the plant growing equipment. Therefore, it is possible to promote the growth of plants more reliably.

In the above aspect, the boiler has a boiler that generates steam by utilizing the heat of combustion in the combustion furnace, and the temperature / moisture adjusting unit cools and heats the exhaust gas by using the steam generated by the boiler. That is preferable.

According to this aspect, the steam generated by the boiler can be effectively used. Therefore, the system can be simplified and the cost can be reduced.

In the above aspect, a boiler that generates steam by utilizing the combustion heat in the combustion furnace, a steam turbine that rotates by the steam generated by the boiler, and power generation that generates electricity by utilizing the rotation of the steam turbine. The temperature / moisture adjusting unit has an electric machine, and the temperature / moisture adjusting unit includes electricity generated by the generator, steam after being used for power generation by the generator, or hot water generated during power generation by the generator. It is preferable to cool and heat the exhaust gas using the above.

According to this aspect, electricity obtained by power generation, steam after being used in power generation, and hot water generated by power generation can be effectively used. Therefore, the system can be simplified and the cost can be reduced.

In the above aspect, it is preferable that the temperature / moisture adjusting unit adjusts the temperature of the exhaust gas and the moisture content of the exhaust gas by diluting the exhaust gas with the outside air.

According to this aspect, the outside air can be effectively used. Therefore, the system can be simplified and the cost can be reduced.

In the above aspect, it is preferable to have a harmful component removing portion for removing harmful components to the plant to be grown in the plant growing facility contained in the exhaust gas.

According to this aspect, the supply of harmful components to plants to the plant growing facility is suppressed. Therefore, it is possible to more reliably promote the growth of plants in the plant growth facility.

In the above aspect, it is preferable that the harmful component removing unit includes a wet scrubber that removes the harmful component by absorbing the component harmful to the plant into a solution.

According to this aspect, the supply of harmful components to plants to the plant growing facility is suppressed. Therefore, it is possible to more reliably promote the growth of plants in the plant growth facility. It is also possible to lower the temperature of the exhaust gas. Therefore, it becomes easy to adjust the temperature of the exhaust gas according to the request from the plant growing facility.

In the above aspect, it is preferable that the fuel is a biomass fuel.

According to this aspect, the amount of carbon dioxide emitted from the exhaust port can be further reduced.

Another aspect of the present invention made to solve the above problems is an exhaust gas supply method for supplying an exhaust gas containing carbon dioxide generated by burning fuel in a combustion furnace to a plant growing facility, wherein the plant growing facility is used. It is characterized in that the temperature of the exhaust gas and the water content of the exhaust gas are adjusted according to a request.

According to this aspect, the exhaust gas containing carbon dioxide can be supplied to the plant growing facility after adjusting the temperature and the water content to meet the requirements of the plant growing facility. Therefore, the temperature and relative humidity of the plant growing facility are controlled to appropriate values for promoting the growing of plants. Therefore, it is possible to promote the growth of plants.

According to the exhaust gas supply system and the exhaust gas supply method of the present invention, it is possible to promote the growth of plants.

It is an overall view of the system in 1st Embodiment. It is a block diagram of the exhaust gas advanced refining equipment in 2nd Embodiment.

[First Embodiment]
<Structure of exhaust gas supply system>
_{The exhaust gas supply system 1 of the present embodiment supplies exhaust gas containing CO 2} generated by burning biomass fuel (wood waste or the like) or fuel such as waste or coal to a plant growing facility and uses it for growing plants. It is a system.

As shown in FIG. 1, the exhaust gas supply system 1 includes a first exhaust gas passage 11, a second exhaust gas passage 12, a combustion furnace 21, a boiler / economizer 22, a bag filter 23, and an attracting ventilator 24. , Damper 31, exhaust gas advanced refining equipment 32, inducer blower 33, each gas analyzer 41, temperature / moisture meter 42, CO ₂ total 43, gas flow meter 44, flow control unit 45, It has a steam turbine 51, a generator 52, and the like.

The first exhaust gas passage 11 and the second exhaust gas passage 12 are passages through which the exhaust gas generated in the combustion furnace 21 flows. In the present embodiment, the second exhaust gas passage 12 is connected to the first exhaust gas passage 11 at a position between the bug filter 23 and the induction ventilator 24 in the first exhaust gas passage 11.

Then, in the first exhaust gas passage 11, the combustion furnace 21, the boiler / economizer 22, the bug filter 23, and the inducer ventilator 24 are arranged in order along the direction in which the exhaust gas flows.

The combustion furnace 21 is a facility for burning biomass fuel, waste, coal, and other fuels. In the present embodiment, the fuel to be burned in the combustion furnace 21 is not limited to biomass fuel, waste, coal, and other fuels, and may be any fuel that generates exhaust gas containing _{CO 2 by burning.} The concentration of CO _{2 in} the exhaust gas varies depending on the difference in fuel and combustion state in the combustion furnace 21, but is, for example, 5 to 20 [%]. The water content in the exhaust gas is, for example, 10 to 20 [vol%] at the position of the outlet of the bag filter 23.

The boiler / economizer 22 is a facility that generates steam by utilizing the heat of exhaust gas. The bug filter 23 is a device that removes soot and dust contained in exhaust gas. The attraction ventilator 24 is a device that sucks exhaust gas.

Further, in the second exhaust gas passage 12, the damper 31, the exhaust gas advanced refining equipment 32, and the induction ventilator 33 for sucking the exhaust gas are arranged in order along the direction in which the exhaust gas flows.

The damper 31 adjusts the flow rate of the exhaust gas to the exhaust gas advanced refining equipment 32 by adjusting the opening area of the second exhaust gas passage 12, and controls the supply amount of the exhaust gas to the horticultural house 81.

The exhaust gas advanced refining equipment 32 removes components harmful to plants contained in the exhaust gas, and adjusts the temperature and water content of the exhaust gas.

The exhaust gas advanced refining equipment 32 includes a trace organic substance / DXNs removing unit 61, a SOx / HCl removing unit 62, a bug filter 63, a NOx removing unit 64, and a CO removing unit 65 in order along the direction in which the exhaust gas flows. , A temperature / moisture adjusting unit 66 is provided. In the present embodiment, the trace organic substance / DXNs removing unit 61, the SOx / HCl removing unit 62, the NOx removing unit 64, and the CO removing unit 65 remove harmful components that remove harmful components to plants contained in the exhaust gas. Corresponds to the department.

The trace organic substance / DXNs removing unit 61 is a device for removing trace organic substances and DXNs (dioxins) contained in exhaust gas by blowing activated carbon or providing an activated carbon filter.

The SOx / HCl removing unit 62 is a device that removes SOx and HCl contained in the exhaust gas by blowing an acid gas removing agent (for example, Na-based chemical or slaked lime) into the exhaust gas. In this way, the SOx / HCl removing unit 62 removes SOx and HCl by blowing a chemical by a dry method, so that a wastewater treatment facility becomes unnecessary, and the system can be enlarged and the cost can be suppressed.

The bug filter 63 is a device that removes soot and dust contained in exhaust gas. The exhaust gas advanced refining equipment 32 may include a HEPA filter (HEPA filter) instead of the bug filter 63. NOx removal unit 64, by reduction to N ₂ NOx contained in the exhaust gas denitration catalyst, a device for removing NOx contained in the exhaust gas. The CO removing unit 65 is a device that removes CO contained in exhaust gas by oxidizing _{CO 2 with an oxidation catalyst or by using an adsorbent.}

The temperature / moisture adjusting unit 66 is a facility that adjusts the temperature and the moisture content of the exhaust gas in response to the request of the horticultural house 81, as will be described in detail later. The temperature / moisture adjusting unit 66 cools and heats the exhaust gas by, for example, heat exchange. The temperature / moisture adjusting unit 66 has a function of adjusting the temperature and the moisture content of the exhaust gas, as well as a calculation function of calculating the amount of water vapor and the like.

Further, in the second exhaust gas passage 12, each gas analyzer 41, a temperature / moisture meter 42, a CO ₂ total 43, and a gas flow meter 44 are arranged at positions between the induction ventilator 33 and the gardening house 81. ing.

Each gas analyzer 41 is a device that analyzes the components in the exhaust gas. The temperature / moisture meter 42 is a device that measures the temperature and moisture content of the exhaust gas. The CO ₂ total 43 is a device for measuring the concentration _{of CO 2 in the exhaust gas.} The gas flow meter 44 is a device for measuring the flow rate of exhaust gas.

The flow rate control unit 45 is a device that controls the flow rate of exhaust gas by adjusting the opening degree of the damper 31 based on the measurement results _{of the CO 2 meter 43 and the gas flow meter 44.}

The steam turbine 51 is connected to the boiler / economizer 22 and rotates by the steam generated by the boiler / economizer 22. The generator 52 generates electricity by utilizing the rotation of the steam turbine 51. The steam turbine 51 and the generator 52 are not essential configurations in the exhaust gas supply system 1, and the exhaust gas supply system 1 does not have to have the steam turbine 51 and the generator 52.

In the first exhaust gas passage 11, the SOx / HCl removing unit 71 may be arranged at a position between the boiler / economizer 22 and the bag filter 23, if necessary, and the bag filter 23 and the bag filter 23. The NOx / DXNs removing unit 72 may be arranged at a position between the attracting blower 24 and the NOx / DXNs removing unit 72.

<Operation of exhaust gas supply system>
In the exhaust gas supply system 1 having the above configuration, the exhaust gas generated in the combustion furnace 21 is discharged from the exhaust port through the first exhaust gas passage 11, while a part of the exhaust gas is discharged through the second exhaust gas passage 12 for horticulture. Supply to house 81. Specifically, the exhaust gas supply system 1 opens the damper 31 and supplies a part of the exhaust gas flowing through the first exhaust gas passage 11 to the horticultural house 81 via the exhaust gas advanced refining equipment 32 and the induction ventilator 33. To do. At this time, the flow rate of the exhaust gas supplied to the gardening house 81 is controlled by the flow rate control unit 45. Further, the temperature and the moisture content of the exhaust gas supplied to the gardening house 81 are adjusted by the temperature / moisture adjusting unit 66.

<Control method of exhaust gas flow rate>
Therefore, first, a method of controlling the flow rate of the exhaust gas performed by the flow rate control unit 45 will be described. The flow rate control unit 45 _{adjusts the opening degree of the damper 31 based on the measurement result of the CO 2} concentration measured by the _{CO 2} total 43 and the exhaust gas flow rate measured by the gas flow meter 44, and goes to the gardening house 81. Control the supply of exhaust gas.

Specifically, the flow rate control unit 45 determines the required amount of exhaust gas supplied to the horticultural house 81 (hereinafter, appropriately referred to as “required exhaust gas amount”) as the required amount of _{CO 2 required by the horticultural house 81.} (Hereinafter, it is appropriately referred to as " _{required amount of CO 2} ") and the concentration _{of CO 2} in the exhaust gas generated in the combustion furnace 21. That is, the flow rate control unit 45 calculates the required amount of exhaust gas using the following mathematical formula.
[Number 1]
(Required exhaust gas amount) = (necessary amount of CO ₂₎ / (concentration of CO ₂ in the exhaust gas)

For example, it is assumed that _{the required amount of CO 2} (purity 100%) is 100 [Nm ³ / h] for the conditions required by the gardening house 81. Further, _{the concentration of CO 2 in} the exhaust gas is 10 [%]. Note that 1 Nm ³ is the amount of gas ^{of 1 m 3} when converted to the standard state (0 ° C., 1 atm).

Then, (required exhaust gas amount) = (100 [Nm ³ / h]) / (10 [%]) = 1000 [Nm ³ / h]. As a result, the flow rate control unit 45 adjusts the opening degree of the damper 31 while checking the measurement result of the flow rate of the exhaust gas in the gas flow meter 44, and increases the supply amount of the exhaust gas to the gardening house 81 by 1000 [Nm ³ / h] is controlled.

Further, since the required amount of exhaust gas varies with time (for example, day and night and season), the flow rate control unit 45 adjusts the opening degree of the damper 31 according to the time to supply the amount of exhaust gas to the gardening house 81. To control. In particular, at night, the plants in the gardening house 81 often do not photosynthesize. Therefore, in a time zone such as nighttime when CO ₂ is not required, the flow rate control unit 45 adjusts the damper 31 to be fully closed (opening degree is 0) so that the exhaust gas does not flow into the second exhaust gas passage 12. As a result, all the exhaust gas flowing through the first exhaust gas passage 11 is discharged from the exhaust port.

<How to adjust the temperature and moisture content of exhaust gas>
Next, a method of adjusting the temperature and the moisture content of the exhaust gas performed by the temperature / moisture adjusting unit 66 will be described. The temperature / moisture adjusting unit 66 adjusts the temperature and the moisture content of the exhaust gas in response to the request from the gardening house 81.

The ratio of the amount of water vapor in the gas is generally expressed as relative humidity (= (amount of water vapor at a certain temperature) / (amount of saturated water vapor at a certain temperature)) in the gas in the greenhouse, and moisture in the exhaust gas. It is often expressed as a rate (= (water vapor amount) / (total exhaust gas amount)). Therefore, in the calculation regarding the amount of water vapor, the ratio of the amount of water vapor in the gas is the volume absolute humidity, the weight absolute humidity, or the amount of water vapor contained in a ^{predetermined volume of the gas (for example, 1 [Nm 3]).} It is desirable to unify the calculation to any one of.

Therefore, in the present embodiment, the ratio of the amount of water vapor in the gas is unified and calculated as the amount of water vapor contained in a predetermined volume of the gas. That is, in the present embodiment, the temperature / moisture adjusting unit 66 calculates the relative humidity and the moisture ^{content by converting them into the amount of water vapor contained in 1 [Nm 3} ] of the exhaust gas, and then calculates the temperature and the moisture content of the exhaust gas. adjust.

Specifically, when adjusting the temperature and moisture content of the exhaust gas, the temperature / moisture adjusting unit 66 first uses the following mathematical formula to describe the amount of water vapor contained per ^{1 [Nm 3] of the exhaust gas before adjustment (hereinafter,} , "The amount of water vapor in the exhaust gas before adjustment") is calculated as appropriate. That is, the temperature / moisture adjusting unit 66 sets the value of the moisture content [vol%] of the exhaust gas before adjustment at the inlet portion of the temperature / moisture adjusting unit 66 as the amount of water vapor contained per ^{1 [Nm 3] of the exhaust gas (unit::} Convert to g / Nm ³ ) and calculate this as the amount of water vapor in the exhaust gas before adjustment. In addition, 1 [L] = 1/1000 [Nm ³ ].
[Number 2]
(Volume of water vapor contained per ^{1 [Nm 3} ] of exhaust gas before adjustment ^{[Nm 3} ]) = (1 [Nm ³ ]) × (Moisture content of exhaust gas before adjustment [vol%])
[Number 3]
(Amount of water vapor in the exhaust gas before adjustment [g / Nm ³ ]) = (Volume of water vapor contained per ^{1 [Nm 3} ] of the exhaust gas before adjustment ^{[Nm 3} ]) / (22.4 [L / mol] ) × (18 [g / mol])

Here, for example, it is assumed that the temperature of the exhaust gas before adjustment is 190 [° C.] and the water content is 20 [vol%].

^{Then, (volume [Nm 3} ] of water vapor contained in ^{1 [Nm 3} ] of the exhaust gas before adjustment) = (1 [Nm ³ ]) × (20 [vol%]) = 0.2 [Nm ³ ]. Become. Then, (amount of water vapor in the exhaust gas before adjustment [g / Nm ³ ]) = (0.2 [Nm ³ ]) / (22.4 [L / mol]) × (18 [g / mol]) = 160 It becomes .7 [g / Nm ^3]. As described above, the amount of water vapor in the exhaust gas before adjustment is calculated as ^{160.7 [g / Nm 3].}

Next, the temperature / moisture adjusting unit 66 uses the following mathematical formula to ^{appropriately describe the amount of water vapor contained in 1 [Nm 3} ] (predetermined volume) of the target exhaust gas (hereinafter, “water vapor in the target exhaust gas”. "Amount") is calculated. That is, the temperature / moisture adjusting unit 66 converts the value of the relative humidity [%] at the temperature required from the gardening house 81 into the amount of water vapor (unit: g / Nm ^{3 ) contained in 1 [Nm 3] of the exhaust gas.} Then, this is calculated as the target amount of water vapor in the exhaust gas.
[Number 4]
(Amount of water vapor in the target exhaust gas [g / Nm ³ ]) = (Amount of saturated water vapor at the temperature required by the gardening house 81 [g / Nm ³ ]) × (Relative humidity at the temperature required by the gardening house 81 [%])

Here, for example, it is assumed that the temperature required from the gardening house 81 is 30 [° C.] and the relative humidity at the temperature required from the gardening house 81 (30 [° C.]) is 60 [%]. The saturated water vapor amount at 30 [° C.] is 33.6 [g / Nm ³ ].

Then, (the amount of water vapor in the target exhaust gas [g / Nm ³ ]) = (33.6 [g / Nm ³ ]) × (60 [%]) = 20.2 [g / Nm ³ ]. In this way, the target amount of water vapor in the exhaust gas is calculated as ^{20.2 [g / Nm 3].}

Next, the temperature / moisture adjusting unit 66 adjusts the temperature of the exhaust gas to the target temperature and adjusts the amount of water vapor in the exhaust gas to the target amount of water vapor based on the above calculation results. That is, using the above numerical example, the temperature of the exhaust gas is adjusted from 190 [° C.] to 30 [° C.], and the amount of water vapor of the exhaust gas is adjusted from 160.7 [g / Nm ³ ] to 20.2 [g / g /. Adjust to Nm ^3].

Here, as a method of adjusting the temperature of the exhaust gas to a target temperature and setting the amount of water vapor in the exhaust gas to the target amount of water vapor, two examples can be considered.

First, in the first embodiment, the temperature / moisture adjusting unit 66 adjusts the temperature of the exhaust gas and the amount of water vapor of the exhaust gas by cooling and heating the exhaust gas. Therefore, the above numerical example will be described. Here, the temperature at which the saturated water vapor content is 20.2 [g / Nm ³ ] is 22.95 [° C.].

Therefore, the temperature / moisture adjusting unit 66 cools the exhaust gas and lowers the temperature of the exhaust gas from 190 [° C.] to 22.95 [° C.]. As a result, the amount of water vapor in the exhaust gas remains the same as the amount of saturated water vapor, but the amount exceeding the amount of saturated water vapor changes to liquid water. That is, the amount of water vapor in the exhaust gas becomes equal to the amount of saturated water vapor at the temperature after the reduction. Therefore, the amount of water vapor in the exhaust gas ^{decreases from 160.7 [g / Nm 3} ] to 20.2 [g / Nm ³ ]. As a result, the amount of water vapor in the exhaust gas becomes the target amount of water vapor [g / Nm ³ ]. That is, the moisture content of the exhaust gas is a target moisture content that satisfies the demand from the gardening house 81. In this way, the temperature / moisture adjusting unit 66 lowers the temperature of the exhaust gas to a predetermined temperature (the temperature at which the saturated water vapor amount becomes equal to the target water vapor amount in the exhaust gas), thereby lowering the water content of the exhaust gas from the gardening house 81. Adjust to the target moisture content that meets the requirements of.

Here, in the present embodiment, the temperature / moisture adjusting unit 66 cools the exhaust gas by heat exchange, and specifically, the following embodiment can be considered. For example, it is conceivable to use the cold water or cold air generated by the absorption chiller 53 to cool the exhaust gas by the heat exchanger of the temperature / moisture adjusting unit 66. At this time, cold water or cold air is generated by the absorption chiller 53 using the steam sent from the steam turbine 51 or using the steam sent directly from the boiler / economizer 22. Alternatively, cold water or cold air is generated by the absorption chiller 53 using steam after being used for power generation by the generator 52 or hot water generated during power generation by the generator 52.

Further, for example, the electricity generated by the generator 52 can be used to generate cold water or cold air by a chiller (not shown) or a cold air conditioner (not shown), and the generated cold water or cold air can be used to cool the exhaust gas. Conceivable.

Next, the temperature / moisture adjusting unit 66 heats the exhaust gas to raise the temperature of the exhaust gas to a target temperature (the temperature required by the gardening house 81). Therefore, using the above numerical example, the temperature / moisture adjusting unit 66 heats the exhaust gas to raise the temperature of the exhaust gas from 22.95 [° C.] to 30 [° C.]. In this way, the temperature / moisture adjusting unit 66 adjusts the temperature of the exhaust gas to a target temperature that satisfies the demand from the gardening house 81.

Here, in the present embodiment, the temperature / moisture adjusting unit 66 heats the exhaust gas by heat exchange, and specifically, the following embodiment can be considered. For example, the steam sent from the steam turbine 51 or the steam sent directly from the boiler / economizer 22 is used to heat the exhaust gas by the heat exchanger of the temperature / moisture adjusting unit 66. Alternatively, the exhaust gas is heated by the heat exchanger of the temperature / moisture adjusting unit 66 using steam after being used for power generation by the generator 52 or hot water generated during power generation by the generator 52.

Further, for example, the electricity generated by the generator 52 is used to generate hot water or hot air by a water heater (not shown) or a hot air blower (not shown), and the generated hot water or hot air is used to heat the exhaust gas. It is conceivable to do.

As described above, the temperature / moisture adjusting unit 66 adjusts the temperature and the moisture content of the exhaust gas by cooling the exhaust gas once and then heating it. That is, the temperature / moisture adjusting unit 66 adjusts the temperature of the exhaust gas and the moisture content of the exhaust gas by lowering the temperature of the exhaust gas to a predetermined temperature and then raising the temperature to the target temperature. Here, the predetermined temperature is a temperature at which the saturated water vapor amount becomes equal to the water vapor amount contained in a predetermined volume of the target exhaust gas.

The above is the description of the first embodiment of the method of adjusting the temperature of the exhaust gas to the target temperature and setting the amount of water vapor in the exhaust gas to the target amount of water vapor.

Further, in the second embodiment of the method of adjusting the temperature of the exhaust gas to the target temperature and setting the water vapor amount of the exhaust gas to the target water vapor amount, the temperature / moisture adjusting unit 66 adjusts the exhaust gas to the outside air (gardening house 81). Dilute with ambient air) to adjust the temperature and moisture content of the exhaust gas. That is, the temperature / moisture adjusting unit 66 adjusts the temperature and the moisture content of the exhaust gas by diluting the exhaust gas with the outside air and then cooling or heating the exhaust gas.

Specifically, the temperature / moisture adjusting unit 66 first uses the following mathematical formula to determine the ^{amount of water vapor contained per 1 [Nm 3} ] in the outside air (hereinafter, appropriately referred to as “the amount of water vapor in the outside air”). calculate.
[Number 5]
(Amount of water vapor in the outside air [g / Nm ³ ]) = (Amount of saturated water vapor at the temperature of the outside air [g / Nm ³ ]) × (Relative humidity [%] at the temperature of the outside air)

Here, for example, it is assumed that the temperature of the outside air is 20 [° C.] and the relative humidity at the temperature of the outside air (20 [° C.]) is 60%. The saturated water vapor amount at the outside air temperature (20 [° C.]) is 18.5 [g / Nm ³ ].

Then, (amount of water vapor in the outside air [g / Nm ³ ]) = (18.5 [g / Nm ³ ]) × (60 [%]) = 11.1 [g / Nm ³ ].

Next, the temperature / moisture adjusting unit 66 calculates the amount of outside air used for diluting the exhaust gas (hereinafter, appropriately referred to as “amount of outside air”) using the following mathematical formula. The amount of outside air is referred to as "A".
[Number 6]
A x (amount of water vapor in the outside air [g / Nm ³ ]) + (amount of exhaust gas required [Nm ³ / h]) x (amount of water vapor in the exhaust gas before adjustment [g / Nm ³ ]) = {A + (necessary) Exhaust gas amount [Nm ³ / h])} × (Target amount of water vapor in exhaust gas [g / Nm ³ ])

Here, using the above numerical example, A × (11.1 [g / Nm ³ ]) + (1000 [Nm ³ / h]) × (160.7 ^{[g / Nm 3} ]) = {A + (1000) a ^{[Nm 3} /h])}×(20.2[g/Nm 3]). From this, the amount of outside air A = 15440 [Nm ³ / h].

Next, the temperature / moisture adjusting unit 66 calculates the temperature of the exhaust gas after diluting the exhaust gas with the outside air (hereinafter, appropriately referred to as “the temperature of the diluted exhaust gas”) using the following mathematical formula.
[Number 7]
(Temperature of exhaust gas after dilution [° C]) = {(Temperature of exhaust gas before adjustment [° C]) x (Required amount of exhaust gas [Nm ³ / h]) + (Temperature of outside air [° C]) x A} / {(Required exhaust gas amount [Nm ³ / h]) + A}

Here, using the above numerical example, (temperature of exhaust gas after dilution [° C.]) = {(190 [° C.]) × (1000 [Nm ³ / h]) + (20 [° C.]) × (15440 []. ^{Nm 3 / h])} /} {(1000 [Nm 3 / h]) + ( the 15440 [Nm 3 /h])}=30.3[℃].

Next, the temperature / moisture adjusting unit 66 cools or heats the exhaust gas to adjust the temperature of the exhaust gas from the temperature of the diluted exhaust gas to a target temperature. Here, using the above numerical example, the temperature / moisture adjusting unit 66 cools the exhaust gas and adjusts the temperature of the exhaust gas from 30.3 [° C.] to 30 [° C.].

In this way, the temperature / moisture adjusting unit 66 adjusts the temperature of the exhaust gas to the target temperature of the exhaust gas, and adjusts the moisture content of the exhaust gas to the target moisture content of the exhaust gas.

The outside air used for diluting the exhaust gas may be cooled or dehumidified in advance. As a result, the amount of outside air required for dilution can be reduced. Further, the temperature / moisture adjusting unit 66 may adjust the temperature of the exhaust gas and the moisture content of the exhaust gas by combining the first embodiment and the second embodiment. At this time, if the outside air is diluted after cooling the exhaust gas, it is possible to eliminate the need for heating the exhaust gas thereafter.

The above is the description of the second embodiment of the method of adjusting the temperature of the exhaust gas to the target temperature and setting the water vapor amount of the exhaust gas to the target water vapor amount.

In the exhaust gas supply system 1, when each gas analyzer 41 measures that the value of each gas component (for example, CO, NOx, SOx, HCl, etc.) exceeds a predetermined value, the damper 31 is fully closed. , The liquefied carbon dioxide gas cylinder 91 may be switched to supply the liquefied carbon dioxide gas to the gardening house 81. For example, since although when the low concentration of CO ₂ in the exhaust gas, it is necessary to increase the amount of exhaust gas, the concentration of CO ₂ in the exhaust gas amount of the exhaust gas becomes very large if very low, its It is necessary to design each removal device with the capacity to process the amount of exhaust gas. Then, the specifications of each removal device become over-specification when the concentration _{of CO 2 in the exhaust gas is normal.} Therefore, _{when the concentration of CO 2 in} the exhaust gas is very low, the damper 31 may be fully closed and the liquefied carbon dioxide gas cylinder 91 may be switched to supply the liquefied carbon dioxide gas to the gardening house 81.

Depending on the exhaust gas generated in the combustion furnace 21, the amount of harmful components to plants may be small. In that case, as a modification, the exhaust gas supply system 1 may not have a harmful component removing device.

Further, the exhaust gas supply system 1 can be applied not only to a biomass power generation facility but also to a garbage incineration facility, a facility having no power generation facility but generating exhaust gas, and the like.

<Effect of this embodiment>
As described above, the exhaust gas supply system 1 of the present embodiment has a temperature / moisture adjusting unit 66 that adjusts the temperature of the exhaust gas and the moisture content of the exhaust gas in response to the request of the gardening house 81. As a result, the _{exhaust gas containing CO 2} can be supplied to the horticultural house 81 after adjusting the temperature and the water content to meet the requirements of the horticultural house 81 who wants to promote the growth of plants. Therefore, by supplying the exhaust gas to the gardening house 81, the temperature and relative humidity of the gardening house 81 are controlled to appropriate values for promoting the growth of plants. Therefore, it is possible to promote the growth of plants in the gardening house 81.

Here, the relative humidity of the horticultural house 81 varies depending on the type of plant, but it is generally desirable that the relative humidity is lower during the daytime when photosynthesis is performed than at nighttime. Further, since the temperature of the gardening house 81 differs greatly between daytime and nighttime, and summer and winter, it is desirable that the temperature is suitable for plant growth according to the time and season. That is, the temperature and relative humidity of the horticultural house 81 do not always have to be constant as long as the plant is specified, and need to be set to values suitable for plant growth according to the time and season. Therefore, according to the exhaust gas supply system 1 of the present embodiment, the temperature and relative humidity of the gardening house 81 are controlled to values suitable for plant growth according to time and season.

Further, according to the exhaust gas supply system 1 of the present embodiment, the temperature and relative humidity of the horticultural house 81 are controlled only by using the exhaust gas supply system containing _{CO 2 (the first exhaust gas passage 11 and the second exhaust gas passage 12).} To. Therefore, the system configuration can be simplified as compared with a system in which the temperature and relative humidity of the gardening house 81 are controlled and CO _{2 is supplied to the gardening house 81 by a separate system.}

Further, since _{a part or all of CO 2 in} the exhaust gas is supplied to the horticultural house 81 for growing plants, the _{amount of CO 2} emitted from the exhaust port can be reduced.

Further, the temperature / moisture adjusting unit 66 adjusts the temperature of the exhaust gas and the moisture content of the exhaust gas by lowering the temperature of the exhaust gas to a predetermined temperature and then raising the temperature to a target temperature. Here, the predetermined temperature is a temperature at which the saturated water vapor amount becomes equal to the water vapor amount contained in a predetermined volume of the target exhaust gas. Thereby, the temperature and the water content of the exhaust gas can be adjusted to the values required by the gardening house 81. Therefore, it is possible to more reliably promote the growth of plants in the gardening house 81.

Further, the temperature / moisture adjusting unit 66 may cool and heat the exhaust gas by using the steam generated by the boiler / economizer 22. As a result, the steam generated by the boiler / economizer 22 can be effectively used. Therefore, the system can be simplified and the cost can be reduced.

Further, the temperature / moisture adjusting unit 66 uses the electricity generated by the generator 52, the steam after use for power generation by the generator 52, or the hot water generated during power generation by the generator 52 to generate exhaust gas. It may be cooled and heated. As a result, electricity obtained by power generation, steam after use for power generation, and hot water generated by power generation can be effectively used. Therefore, the system can be simplified and the cost can be reduced.

Further, the temperature / moisture adjusting unit 66 may adjust the temperature of the exhaust gas and the moisture content of the exhaust gas by diluting the exhaust gas with the outside air. As a result, the outside air can be effectively used. Therefore, the system can be simplified and the cost can be reduced.

In addition, the exhaust gas supply system 1 has a harmful component removing unit that removes harmful components to plants grown in the gardening house 81 contained in the exhaust gas. As a result, the supply of harmful components to plants to the gardening house 81 is suppressed. Therefore, it is possible to more reliably promote the growth of plants in the gardening house 81.

Further, by using the biomass fuel as the fuel to be burned in the combustion furnace, the _{amount of CO 2} emitted from the exhaust port can be further reduced.

[Second Embodiment]
Next, the second embodiment will be described, but the components equivalent to those in the first embodiment are designated by the same reference numerals, the description thereof will be omitted, and the differences will be mainly described.

As shown in FIG. 2, the exhaust gas advanced refining equipment 32 of the present embodiment is provided with a wet scrubber 67 instead of the SOx / HCl removing unit 62. In the present embodiment, the trace organic substance / DXNs removing unit 61, the NOx removing unit 64, the CO removing unit 65, and the wet scrubber 67 correspond to the harmful component removing unit.

The wet scrubber 67 is separated and removed (wet removal) by spraying a solution such as water on the exhaust gas and absorbing SOx and HCl in the exhaust gas in the solution. By using the wet scrubber 67, HCl and SOx can be removed, and the temperature of the exhaust gas can be lowered. For example, the wet scrubber 67 can also reduce the temperature of the exhaust gas from 190 [° C.] to 40 [° C.] to 50 [° C.]. Therefore, depending on the request from the gardening house 81, the temperature of the exhaust gas may be set to the target temperature of the exhaust gas by the wet scrubber 67.

As described above, the exhaust gas advanced refining equipment 32 of the present embodiment includes the wet scrubber 67. As a result, the supply of harmful components to plants to the gardening house 81 is suppressed. Therefore, it is possible to more reliably promote the growth of plants in the gardening house 81. It is also possible to lower the temperature of the exhaust gas. Therefore, the temperature of the exhaust gas can be easily adjusted according to the request from the gardening house 81.

It should be noted that the above-described embodiment is merely an example and does not limit the present invention in any way, and it goes without saying that various improvements and modifications can be made without departing from the gist thereof.

1 Exhaust gas supply system 11 1st exhaust gas passage 12 2nd exhaust gas passage 21 Combustion furnace 22 Boiler / economizer 31 Damper 32 Exhaust gas advanced purification equipment 43 CO ₂ Total 44 Gas flow meter 45 Flow control unit 51 Steam turbine 52 Generator 53 Absorption Type Refrigerator 61 Trace organic substance / DXNs removal unit 62 SOx / HCl removal unit 63 Bug filter 64 NOx removal unit 65 CO removal unit 66 Temperature / moisture adjustment unit 67 Wet scrubber 81 Gardening house

Claims (8)

In an exhaust gas supply system that supplies a part of the exhaust gas containing carbon dioxide that flows through the first exhaust gas passage generated by burning fuel in the combustion furnace to the plant growing facility through the second exhaust gas passage.
The second exhaust gas passage has a temperature / moisture adjusting unit having a function of adjusting the temperature of the exhaust gas and the moisture content of the exhaust gas and a calculation function of calculating the amount of water vapor in response to the request of the plant growing facility.
After treating the exhaust gas flowing through the first exhaust gas passage, a part of the exhaust gas flows through the second exhaust gas passage and is treated by an exhaust gas advanced refining facility .
The temperature / moisture adjusting unit converts the value of relative humidity at the temperature required by the plant growing facility into the amount of water vapor contained in a predetermined volume of the exhaust gas, and sets this as the target amount of water vapor in the exhaust gas. An exhaust gas supply system, which is calculated, lowers the temperature of the exhaust gas to a temperature at which the saturated water vapor amount becomes equal to the water vapor amount in the target exhaust gas, and then raises the temperature to the temperature required by the plant growing facility. .. In the exhaust gas supply system of claim 1,
It has a boiler that uses the heat of combustion in the combustion furnace to generate steam.
The temperature / moisture adjusting unit cools and heats the exhaust gas using the steam generated by the boiler.
An exhaust gas supply system featuring. In the exhaust gas supply system of claim 1,
A boiler that uses the heat of combustion in the combustion furnace to generate steam,
A steam turbine that is rotated by the steam generated by the boiler, and
It has a generator that generates electricity by utilizing the rotation of the steam turbine.
The temperature / moisture adjusting unit uses electricity generated by the generator, steam after being used for power generation by the generator, or hot water generated during power generation by the generator to generate the exhaust gas. Cooling and heating,
An exhaust gas supply system featuring. In the exhaust gas supply system according to any one of claims 1 to 3,
The temperature / moisture adjusting unit adjusts the temperature of the exhaust gas and the moisture content of the exhaust gas by diluting the exhaust gas with the outside air.
An exhaust gas supply system featuring. In the exhaust gas supply system according to any one of claims 1 to 4.
Having a harmful component removing part for removing harmful components to plants to be grown in the plant growing facility contained in the exhaust gas.
An exhaust gas supply system featuring. In the exhaust gas supply system of claim 5,
The harmful component removing unit includes a wet scrubber that removes harmful components by absorbing the components harmful to the plant into a solution.
An exhaust gas supply system featuring. In the exhaust gas supply system according to any one of claims 1 to 6,
The fuel is a biomass fuel,
An exhaust gas supply system featuring. In the exhaust gas supply method in which a part of the exhaust gas containing carbon dioxide flowing through the first exhaust gas passage generated by burning fuel in the combustion furnace is supplied to the plant growing facility through the second exhaust gas passage.
A temperature / moisture adjusting unit having a function of adjusting the temperature of the exhaust gas and the moisture content of the exhaust gas and a calculation function of calculating the amount of water vapor is provided in the second exhaust gas passage according to the request of the plant growing facility. And
After treating the exhaust gas flowing through the first exhaust gas passage, a part of the exhaust gas is passed through the second exhaust gas passage and treated by an exhaust gas advanced refining facility.
The temperature / moisture adjusting unit converts the value of relative humidity at the temperature required by the plant growing facility into the amount of water vapor contained in a predetermined volume of the exhaust gas, and sets this as the target amount of water vapor in the exhaust gas. A method for supplying an exhaust gas, which is calculated, lowers the temperature of the exhaust gas to a temperature at which the saturated water vapor amount becomes equal to the water vapor amount in the target exhaust gas, and then raises the temperature to a temperature required by the plant growing facility. ..

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